Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 516 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
5. 5.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
6. 6.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) switch off empty rooms
8. 8.True or false: to leave fridge door open wastes electricity. (a) True (b) False
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
16. 16.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.True or false: to use LED lamps saves electricity. (a) True (b) False
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
19. 19.True or false: to leave the TV on standby saves electricity. (a) False (b) True
20. 20.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
27. 27.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to use LED lamps wastes electricity. (a) False (b) True
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
34. 34.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity

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